Precision Caged Ball Screw
The use of a ball cage in the Caged Ball ball screw eliminates collision and friction between balls and increases grease retention. This makes it possible to achieve low noise, low torque fluctuation, and long-term maintenance-free operation.
In addition, this ball screw excels in high-speed applications because of an ideal ball recirculation structure, a strengthened circulation path, and the use of a ball cage.
Types
Highlight feature tags
- Long-term maintenance free
- High speed
- High-load ball screw
- Large lead
- Preload
- No preload
- Offset preload
- Return-pipe type
- Return-piece
- End-cap type
- For presses
- Precision positioning (ball screw)
- Double nut preload
- Precision positioning (ball screw)
- Long-term maintenance free
- Preload
- Offset preload
- High speed
- Return-pipe type
- Return-piece
Screw shaft diameters (mm) : 16,20,25,28,32,36,40,45,50
- Precision positioning (ball screw)
- Long-term maintenance free
- Large lead
- Preload
- Offset preload
- High speed
- End-cap type
Screw shaft diameters (mm) : 15,16,20,25,32,36,40,50,55
- Precision positioning (ball screw)
- Long-term maintenance free
- Large lead
- Preload
- Double nut preload
- High speed
- End-cap type
Screw shaft diameters (mm) : 36,40,50,55
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
Screw shaft diameters (mm) : 50,63,80
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
Screw shaft diameters (mm) : 63,80,100,120,140
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
- Return-piece
Screw shaft diameters (mm) : 32,36,40,50,63
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
- Return-pipe type
- For presses
Screw shaft diameters (mm) : 40,63,80,100,120,140
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- Large lead
- No preload
- High speed
- End-cap type
Screw shaft diameters (mm) : 63,80,100,120
Features
Structure and Features
The use of a ball cage in the Caged Ball ball screw eliminates collision and friction between balls and increases grease retention. This makes it possible to achieve low noise, low torque fluctuation, and long-term maintenance-free operation.
In addition, this ball screw excels in high-speed applications because of an ideal ball recirculation structure, a strengthened circulation path, and the use of a ball cage.
Advantages of Caged Ball Technology
Low noise and reduced running sound
The use of the ball cage eliminates the sound of collision between the balls. Additionally, as balls are picked up in the tangential direction, the collision noise from ball recirculation has also been eliminated.
Long-term maintenance-free operation
The absence of friction between balls and the retention of lubrication in grease pockets enable long-term maintenance-free operation (i.e., lubrication is unnecessary over a long period).
Smooth Motion
Use of a ball cage eliminates friction between balls and minimizes the torque fluctuation, allowing for smooth motion.
Low noise
● Noise Level Data
Since the balls in a caged ball screw do not collide with each other, they do not produce a metallic sound and a low noise level is achieved.
■ Noise Measurement
|
Item |
Description |
|---|---|
|
Sample |
Caged ball screw HBN3210-5 Conventional Type: Model BNF3210-5 |
|
Stroke |
600 mm |
|
Lubrication |
Grease lubrication (lithium-based grease containing extreme pressure agent) |
Long-term maintenance-free operation
● High speed and high load-bearing capacity
Thanks to high-speed ball circulation and the effects of Caged Ball technology, a ball screw with a ball cage excels in speed and durability while bearing a load.
■ High speed durability test
|
Item |
Description |
|---|---|
|
Sample |
High-speed ball screw with ball cage SDA3110V-5 |
|
Speed |
5,000 min-1 (DN value1: 160,000) |
|
Stroke, |
500 mm |
|
Lubricant |
THK AFJ Grease |
|
Quantity |
4 cm3 (lubricated every 500 km) |
|
Applied Load |
1.27 kN |
|
Acceleration |
0.5 G |
1DN value: Ball center-to-center diameter x revolutions per minute
Test Results
Shows no deviation after running for 6,000 km
■ Load bearing test
|
Item |
Description |
|---|---|
|
Sample |
High Speed Ball Screw with Ball Cage SBN5016V-5 |
|
Speed |
1,500 min-1 (DN value1: 79,000) |
|
Stroke |
400 mm |
|
Lubricant |
THK AFG Grease |
|
Quantity |
57.7 cm3 (lubricated every 100 km) |
|
Applied load |
36.1 kN (0.38 Ca) |
|
Acceleration |
0.5 G |
Test result
Shows no deviation after running for the calculated service life
Smooth Motion
● Low torque fluctuation
The Caged Ball technology allows smoother motion than the conventional type and reduces torque fluctuation.
|
Item |
Description |
|---|---|
|
Shaft diameter |
25/5 mm |
|
Shaft rotational |
100 min-1 |
Examples of Assembling Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH
If using models HBN-V, HBN-K, HBN-KA, HBN, or SBKH under a large load, arrange the nut flange and the fixed-side support unit in relation to the loading direction as indicated in the figures below while taking into account the load balance of the balls. In addition, be sure not to apply a tensile load to the bolts while the unit is operating. If you intend to use this product in configurations other than those below, contact THK.
Example Assembly of Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH (Recommended)
Example Assembly of Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH (Not Recommended)
